diff --git a/tests/test_util.py b/tests/test_util.py
index 8ea851ed..dae5b13c 100755
--- a/tests/test_util.py
+++ b/tests/test_util.py
@@ -21,8 +21,10 @@ from unittest import TestCase, main
 environ['XRAY_DATABASE_ROOT'] = '.'
 environ['XRAY_PART'] = './'
 
-from prjxray.util import get_roi
-
+from prjxray.util import get_roi, get_db_root
+from prjxray.db import Database
+from prjxray.overlay import Overlay
+from prjxray.grid_types import GridLoc
 
 @contextmanager
 def setup_database(contents):
@@ -69,6 +71,17 @@ class TestUtil(TestCase):
             self.assertListEqual(
                 list(get_roi().gen_sites()), [('ATILE', 'FOO', 'BAR')])
 
+    def test_in_roi_overlay(self):
+        db = Database(get_db_root(), './database/artix7/xc7a50tfgg484-1')
+        region_dict = {}
+        region_dict['pr1'] = (10, 58, 0, 51)
+        region_dict['pr2'] = (10, 58, 52, 103)
+        overlay = Overlay(db.grid(), region_dict)
+        self.assertFalse(overlay.tile_in_roi(GridLoc(18, 50)))
+        self.assertFalse(overlay.tile_in_roi(GridLoc(18, 84)))
+        self.assertTrue(overlay.tile_in_roi(GridLoc(8, 50)))
+        self.assertTrue(overlay.tile_in_roi(GridLoc(18, 112)))
+        self.assertTrue(overlay.tile_in_roi(GridLoc(80, 40)))
 
 if __name__ == '__main__':
     main()